feat(agentctl): protocol adapter abstraction with agent profile support (#15)

* feat(agentctl): implement protocol adapter abstraction

- Add AgentAdapter interface for protocol-agnostic agent communication
- Create ACPAdapter implementation for ACP protocol (JSON-RPC over stdin/stdout)
- Add Protocol field to agent registry (AgentTypeConfig)
- Update process.Manager to use adapters instead of hardcoded ACP
- Update API layer to use adapter interface
- Pass protocol from registry to agentctl via CLI flag and env var
- Support protocol configuration in both Docker and standalone modes

This refactoring allows agentctl to support multiple protocols (ACP, REST, MCP)
via a pluggable adapter pattern. The backend remains protocol-agnostic,
always communicating with agentctl's HTTP API.

* refactor(agentctl): consolidate types and clean up code

- Create shared types package (internal/agentctl/types) for permission types
- Create shared protocol package (pkg/agent) for Protocol type
- Remove duplicate permission types from acp/client.go and adapter.go
- Make adapter the single source of truth for session ID
- Remove unused Command field from adapter.Config
- Remove passthrough wrapper function handleAdapterPermissionRequest
- Clean up extra empty lines in process/manager.go and acp_adapter.go
- Re-export permission types from adapter package for convenience

* fix(agent-session): rename AgentType to AgentProfileID for consistency

- Rename AgentSession.AgentType to AgentProfileID in models
- Update agent_sessions table schema column from agent_type to agent_profile_id
- Update all SQL queries in sqlite.go to use agent_profile_id
- Fix ToAPI() method to return agent_profile_id key
- Remove misleading comments in executor.go

Also adds comprehensive tests for affected areas:
- adapter package unit tests (SessionUpdate, PlanEntry, AgentInfo, Config)
- profile resolver unit tests with mock repository
- AgentSession CRUD tests in sqlite_test.go

apps/backend/internal/agent/registry/registry.go

@@ -11,6 +11,7 @@ import (
 	"go.uber.org/zap"
 
 	"github.com/kandev/kandev/internal/common/logger"
+	"github.com/kandev/kandev/pkg/agent"
 	v1 "github.com/kandev/kandev/pkg/api/v1"
 )
 
@@ -31,6 +32,10 @@ type AgentTypeConfig struct {
 	Capabilities   []string          `json:"capabilities"`           // What the agent can do
 	Enabled        bool              `json:"enabled"`
 	ModelFlag      string            `json:"model_flag,omitempty"`   // CLI flag for model selection (e.g., "--model")
+
+	// Protocol configuration
+	Protocol       agent.Protocol    `json:"protocol,omitempty"`        // Communication protocol: "acp", "rest", "mcp"
+	ProtocolConfig map[string]string `json:"protocol_config,omitempty"` // Protocol-specific settings (e.g., base_url for REST)
 }
 
 // MountTemplate defines a mount with template support